CN1304587A - Transmit diversity method and system - Google Patents

Abstract

The invention relates to a transmit diversity method for a wireless communication system comprising a transmitting element and at least one receiver, wherein a transmission signal is transmitted from the transmitting element to the at least one receiver in accordance with a weight information determined in response to a feedback information. The feedback information is derived from the response at the at least one receiver to the transmission signal, and is fed back using multiplexed feedback signals. Multiple feedback signal quantization constellations and/or constellation specific feedback subchannels can be used for channel probing, such that the total feedback resolution and robustness can be enhanced, while maintaining low signaling capacity of the feedback channel.

Description

Emission diversity method and system

The present invention relates to a kind of wireless communication system of a transmitter unit and at least one receiver such as the emission diversity method and system of Universal Mobile Telecommunications System (UMTS) of comprising.

Wideband Code Division Multiple Access (WCDMA) (WCDMA) has been selected as the wireless technology of the paired wave band of UMTS.Therefore, WCDMA is the common wireless technology standard of third generation wide area mobile communication.WCDMA is applicable to high-speed data service, is particularly useful for the grouped data based on the internet, and this grouped data is higher than 384kbps in wide area up to 2Mbps under indoor environment.

WCDMA thought is based on a kind of novel channel architecture that is fit to all layers, and this channel architecture is based on the technology such as Packet Data Channel and service integration.This new thought also comprises pilot code element and a kind of structure of time slot that is equipped with adaptive array, and adaptive array can make antenna beam aim at the user, so that maximum range and minimum interference to be provided.This also is very important when realizing the limited broadband technology of available spectrum of radio frequencies.

Can utilize different technology to improve the uplink capacity of the WCDMA system that is proposed, these technology comprise the reception of many antennas and Multiuser Detection or interference eliminated.The technology that improves downlink capacity can not realize with identical intensity.Yet the needed capacity requirement of the data service of being planned (for example internet) makes the downlink channel burden heavier.Therefore, must provide some can improve the technology of the capacity of downlink channel.

Consider the strict composition requirement of terminal and the feature of downlink channel, configuration composite received antenna is not a kind of scheme of desirable solution downlink capacity problem.Therefore, proposed some other scheme, in these schemes, the multiple antenna or the transmit diversity at place, base station can improve downlink capacity, and only increase the complexity that terminal realizes slightly.

According to the WCDMA system, transmit diversity thought is just under consideration, and the principal focal point of this thought is closed loop (feedback) mode.

Fig. 1 shows base station (BS) 10 and portable terminal is an example of this feedback system of the downlink transmission between the travelling carriage (MS) 20.Specifically, BS 10 comprises two antenna A1 and A2, and MS 20 can carry out the channel estimation according to two transmission signals from two antenna A1 and A2.Then, MS 20 feeds back to BS10 with discrete channel estimation.These antenna (or antenna element) A1 and A2 are enough approaching each other, make antenna A1 and A2 separately and the propagation delay between the MS 20 basic identical (in the scope of the part of the chip duration of WCDMA extended code).This is very important for the orthogonality that keeps the down link in the single channel channel.Certainly, also require to develop sound low delay feedback signaling thought.

In WCDMA, for the closed loop thought that is optimized at two antennas different modes has been proposed.In selectivity transmit diversity (STD) mode, signal to " the best " antenna of each terminal with the mode of every time slot 1 bit.MS 20 selects stronger antenna (two kinds of possibilities), and utilizes the subchannel of 1.5kbps that this index is sent to BS 10 according to (relevant with specific antenna or beam) public pilot signal estimation channel coefficients.Therefore, can obtain simple dedicated channel estimation from continuous common channel estimation.In the STD mode, the bit length of feedback signaling word is 1 bit.The feedback bits rate is 1500bps, and the feedback signaling word is used for controlling the power that is input to antenna A1 and A2.

Moreover, for slow based on feedback link, suggestion employing mode 1 and 2 (being called transmit antenna battle array (TxAA) mode), are in this based on feedback link, behind the time slot of some, revise to be used for the power of transmission signals of control antenna A1 and A2 and/or the feedback weight of phase place.Specifically, utilize the subchannel of 1.5kbps will quantize feedback and be notified to BS 10.In mode 1, from QPSK clump (constellation), select feasible Tx feedback weight.In mode 2, from 16 state clumps, select feasible Tx feedback weight.

Fig. 2 shows the table of the characteristic parameter of an expression aforesaid way.Specifically, N _FBThe number of bits of feedback of representing every time slot, Nw represents the bit number of every feedback signaling word, Na represents to be used for the multiplication factor at control antenna A1 and A2 place or the number of bits of feedback of power, and Np represents to be used for the number of bits of feedback of the phase difference between control antenna A1 and the A2.Listed in the table as Fig. 2, in every kind of feedback system, every time slot feeds back 1 bit.

Therefore in Tx AA mode 1, the feedback signaling word comprises 2 bits, all is received back (promptly two time slot after) at these two feedback bits and just upgrades.This feedback signaling word only is used for controlling the phase difference between two antenna A1 and the A2.

In TxAA mode 2, the bit length of feedback signaling word is 4, and therefore per 4 time slots once upgrade.Specifically, 1 bit of this feedback signaling word is used for the multiplication factor (power) at control antenna A1 and A2 place, and 3 bits are used for controlling their phase difference.

Fig. 3 A shows the table of the feedback power control of being carried out in the expression STD mode.Here, MS 20 must estimate antenna with the minimal path loss.For this reason, the channel power of MS 20 estimations all " competition antennas ", and that antenna of determining to have peak power.Required channel estimation can for example obtain with the public channel of piloting that known power was sent from each antenna.Value of feedback and the power P that is input to antenna A1 have been shown in the table of Fig. 3 A _A1With the power P that is input to antenna A2 _A2Between correlation.Therefore, at BS 10 places, select one of these two antenna A1 and A2 according to the feedback signaling value.

Should be noted that the STD mode can realize with analog form in the beam territory.In this case, the channel symbol Rotate 180 that whether antenna A2 sent of MS 20 notice BS 10 °.Like this, BS 10 can launch simultaneously from two antenna A1 and A2.Therefore, the phase difference between antenna A1 and the A2 is changed between 0 ° and 180 ° according to value of feedback.

In TxAA mode 1 and 2, the channel parameter that MS 20 estimates and quantizes institute sends to BS 10, and then, BS 10 correspondingly is weighted the signal that is sent.Therefore, (as providing in the STD mode) resolution of 180 ° can be provided.MS 20 selects Tx weighting (Tx beam) respectively from 4 or 16 different clumps.

Fig. 3 B shows the FEEDBACK CONTROL that realizes in TxAA mode 1, only will comprise that wherein the phase weighting value of feedback of 2 bits feeds back to BS 10.Represented phase difference has stipulated that BS 10 is for the antenna A1 that obtains best coherence will establish in MS 20 and phase difference (number of degrees) between the A2 in the table of Fig. 3 B.

Fig. 3 C shows the FEEDBACK CONTROL of TxAA mode 2, and wherein 1 bit of feedback signaling word (being the multiplication factor bit) is used for the power of control antenna A1 and A2, and all the other 3 bits (being phase bits) are used for phase difference between control antenna A1 and the A2.Left-handed watch is represented the power control based on the multiplication factor bit, wherein, is input to the power P of antenna A1 and A2 _A1And P _A2Respectively predetermined value 20% and 80% between the conversion.Right table expression is based on the FEEDBACK CONTROL of 3 phase bits, and wherein, phase difference can be quantized into the value of BS 10 for 8 different phase differences obtaining best coherence will establish in MS 20.

As for the table among Fig. 2, should be noted that under the various situations of Na=0 the power that imposes on antenna A1 and A2 equates.Moreover antenna A1 and A2 are well-determined by its sign indicating number institute of piloting separately of the CCPCH of UMTS (public control physical channel).Resulting amplitude and the phase place that imposes on antenna A1 and A2 is called as weighting, and this group weighting can be formed a weight vectors.Specifically, for the situation of two antennas here, its weight vectors is: $\underset{-}{W}=\left[\frac{\sqrt{\mathrm{<figure-callout\; id="1"\; label="PA"\; filenames="A00800870.100311.png,A00800870.100341.png"\; state="\{\{state\}\}">PA</figure-callout>}1}}{\sqrt{\mathrm{<figure-callout\; id="2"\; label="PA"\; filenames="A00800870.100311.png"\; state="\{\{state\}\}">PA</figure-callout>}2}.\exp (\mathrm{i\&pi;\&Delta;\&phi;}/180)}\right]$

Wherein, Δ φ represents to feed back to the phase difference (phase weighting) of BS 10.The dimension of w greater than 2 situation under, needing plural antenna be antenna array.As an example, can utilize the relative phase between the antenna to realize directional antenna.Therefore, the phase place of the feedback signal in the complex plane of being estimated is used for controlling transmit direction.For coherent array, between each adjacent antenna unit, relative phase difference is identical.

Therefore, existing WCDMA transmit diversity feedback thought utilizes 2,4 or 8 phase place clumps that the channel difference is notified to BS 10.Yet, obtain the higher channel resolution that high-order clump is more provided, be able to the feedback signaling capacity or time-delay is cost.Therefore, the resolution of feedback signaling is subjected to the restriction of feedback signaling capacity.Moreover existing thought has adopted the time-delay of one or more time slots when realizing that weighting changes, the scope of application can only be confined to very slow fading channel like this.In addition, these thoughts also may be to the feedback error sensitivity.

Therefore, the objective of the invention is to, a kind of transmit diversity is provided or launches beam-forming method and system, utilize this method and system, can under the prerequisite that does not increase the feedback signaling capacity, improve the resolution of feedback signaling.

Reach this purpose by a kind of emission diversity method of the wireless communication system of a transmitter unit and at least one receiver that comprises, described method comprises the steps:

According to the determined weighted information of feedback information transmission signals is sent to described at least one receiver from described transmitter unit;

From of the response of described at least one receiver, obtain described feedback information to described transmission signals;

Utilize multiplexing feedback signal to feed back described feedback information.

In addition, also the transmit diversity systems by a kind of wireless communication system achieves the above object, and this system comprises:

Emitter is used for according to the determined weighted information of feedback information transmission signals being sent from transmitter unit; With

At least one receiver is used for receiving described transmission signals and obtains described feedback information from the response to described transmission signals;

Wherein, described at least one receiver comprises feedback device, is used to utilize multiplexing feedback signal to feed back described feedback information.

Moreover also the transmitter by a kind of wireless communication system achieves the above object, and this transmitter comprises:

Extraction element is used for extracting feedback information from received signal;

Emitter is used for according to weighted information transmission signals being sent from transmitter unit;

Determine device, be used for determining weighted information according to the feedback information that is extracted; With

Control device is used to control definite device, so that determine described weighted information according to the used multiplexing feedback signal of the described feedback information of feedback.

Moreover also the receiver by a kind of wireless communication system achieves the above object, and this receiver comprises:

Receiving system is used to receive transmission signals;

Obtain device, be used for obtaining feedback information from response to described transmission signals; With

Feedback device is used to utilize multiplexing feedback signal to feed back described feedback information.

Therefore, in transmitter, according in the terminal the time become the clump of feedback signal and quantize clump, resolution and the capacity by keeping the feedback channel that receiver notifies also carries out suitable feedback filtering, can improve emission resolution.In view of the above, can improve the effective resolution of total feedback signaling, keep the signaling channel capacity simultaneously, this is because for example according to the clump of time varying signal or utilize a plurality of different clumps, feedback information can be cut apart and be extended in the different time slot groups.Filtering can be applicable on two subchannels at least.Send detectable signal that signal can comprise that channel measurement and channel quantitative are used and according to the emission weighting through information that dedicated channel sent.

According to the present invention, multiplexing feedback signal can be used to represent the quantification state of channel.In view of the above, in the different multiplexing subchannel of time-division, frequency division or code division multiplexing mode defined, the type of feedback signal, coding, division or distribution can be different.

Therefore, the weighting that imposes on antenna A1 and A2 can decompose from feedback channel, and needn't be consistent with the feedback signaling of the current time slots that receives from receiver.Specifically, can adopt multicircuit time, so that can also establish current feedback system.Each subchannel can be stipulated base resolution independently, and these subchannels can be united the higher resolution of regulation.According to the present invention, use at least two feedback subchannels.Multiplexing feedback signal is filtered again by demultiplexing in transmitter unit, so that obtain required emission weighting.After the filtering, can be Tx weighting clump with the weight quantization of being estimated.Therefore, can realize a kind of thought of feeding back flexibly, wherein, the emission weighting obtains from feedback signal and need not complete and their couplings.

Moreover, higher emission weighting resolution for example can realize that with robustness these signals will be synthesized with suitable manner (as by finite impulse response (FIR) (FIR) filtering or infinite impulse response (IIR) filtering) by multiplexing different feedback signal in transmitter.Filtering also may relate to the reliability of institute's receiving feedback signals.So filter can be determined these weightings according to the higher weighting of reliable feedback signal.Therefore, can reach the resolution of existing TxAA mode 2, this is because it can be according to existing TxAA mode 1 for example by multiplexing two different feedback signals and they are carried out suitable filtering establish.In this case, can keep the estimation of feedback signaling and channel, and the slight modification feedback signal is definite.Yet, need not common channel is changed.

From slowly adopting on the meaning of longer filter, the length of filter impulse response and channel characteristics (for example Doppler's expansion or auto-correlation) are matched when channel variation.The type of filter can determine that perhaps it can be consulted according to received signal between transmitter and receiver.Moreover, can perhaps according to the two, carry out demultiplexing and follow-up filtering according to feedback signal or according to launching weighting accordingly with feedback signal.Specifically, gain and phase information can be filtered separately or filtered jointly.In order to reduce time-delay and to improve the weighting precision, filter can resemble works the fallout predictor, like this, can test the emission weighting according to available information after level and smooth, up to send order (current weighting and/or before weighting and/or the feedback command that is received).In addition, this filtering can be linearity or nonlinear.Moreover, can use healthy and strong filtering (for example adopting medium filtering), this filtering is that institute is preferred, this is because feedback error is because of the wrong index when determining index/quantification but not be out of one's reckoning and may cause the weighting of " periphery " weighting mistake.

Therefore, channel is quantified as a plurality of feedback signals and quantizes clump, and each quantized value is sent out by different multiplexing feedback subchannels.In view of the above, the user can utilize the different channels of different quantized intervals (may be overlapping) to quantize clump.Different quantification clumps can be independently (for example suitable rotations each other), perhaps can divide with relevant or hierarchical approaches and constitute by group, wherein relevant Cong Gongtong is used for determining to have more high-precision feedback signal (for example preceding two bits that send with first subchannel can be specified the weighting quadrant, and can specify one of two weighted points in this weighting quadrant with the 3rd bit that second subchannel sends).Moreover different quantification clumps can offer different users.

Multiplexing feedback signal preferably can comprise first feedback signal with first clump and second feedback signal with second clump.First and second feedback signals can and/or adopt different codes to send with different time slots.

First feedback signal can be stipulated to estimate determined first phase weighting according to channel, and second feedback signal can be stipulated according to determined second phase weighting of rotation clump.Specifically, second phase weighting can be based on the rotation channel estimation of same clump, or based on the rotation channel estimation of another clump, or the quantification of estimating based on the channel of second (rotation) clump.First and second feedback signals can be fed in continuous slot.Moreover first feedback signal can be stipulated the real part of weighted information, and second feedback signal can be stipulated the imaginary part of weighted information.

In addition, first feedback signal can stipulate to be used for to upgrade first feedback information of first beam of transmitter unit, and second feedback signal can stipulate to be used for to upgrade second feedback information of second beam of transmitter unit.In this case, first feedback signal can be fed during strange time slot, and second feedback signal can be fed during even time slot.Strange and even time slot can be used for controlling respectively the same antenna (when adopting bad channel) or control first antenna and second antenna in the different time intervals.Under latter event, first and second antennas alternately as a reference.Under the situation of the ERP that can reduce institute's control antenna by filtering, the method that preferably for example in an alternating manner control command is sent to transmitter unit is controlled two antennas.When two antennas were generally controlled, ERP also can be assigned with equably, and the design of the power amplifier that provides so just has been provided.Another kind of feasible scheme is to adopt transmit diversity techniques, and in this technology, different users can control different antennas.

Moreover first feedback signal can be come the regulation quadrant by the 4-PSK clump, and second feedback signal can be stipulated the clump in the described quadrant of the described first feedback signal defined.Second feedback signal can be stipulated difference variation, the sub-quadrant of Gray code or their combination.

Multiplexing feedback signal can be sent by at least two users with different feedback signal clumps.In view of the above, can realize a kind of not only flexible but also suitable transmit diversity systems.These at least two users can comprise first group of user of the weighting in first antenna of controlling transmitter unit and control second group of user of the weighting in second antenna of described transmitter unit.Some filtering or demultiplexing technology like this, can realize the active balance of the transmitting power between first and second antennas, because need may require lower transmitting power in the antenna of being controlled.

Moreover the control device in the transmitter can comprise a switching device shifter, is used for alternately first feedback signal and second feedback signal being switched to definite device.Determine that device can be used for obtaining weighted information from first and second feedback signals.

Moreover, control device can be used to control emitter, upgrade first beam of transmitter unit and utilize second beam that upgrades transmitter unit according to determined second weighted information of second feedback signal so that alternately utilize according to determined first weighted information of first feedback signal.

This transmitter unit can be an antenna array.In this case, feedback information can be used to the transmit direction of array of controls antenna.Transmit direction can from multiplexing feedback signal one of at least obtain.Moreover transmit direction can also obtain from the phase estimation that obtains according at least one feedback signal.

Moreover the acquisition device of receiver can comprise extraction element, is used to extract the detectable signal that sends with known power; Channel estimating apparatus is used for carrying out the channel estimation according to the detectable signal that is extracted; And generation device, be used for according to the multiplexing feedback signal of channel estimation generation.Generation device can be used for producing first and second feedback signals, and wherein feedback device can be used for feeding back first and second feedback signals as multiplexing feedback signal.Feedback device can alternately feed back first and second feedback signals, and wherein the quantification of feedback information is based on that available clump in the estimation of up-to-date channel and first and second clumps.

Moreover generation device can be used for producing based on first feedback signal of channel estimation with based on second feedback signal of this channel estimation by the predetermined angular rotation.This also can realize by same channel estimator being turned to two clumps (in this case, second clump is first clump swivel replication).

Perhaps, generation device can be used for producing based on first feedback signal of the real part of feedback information with based on second feedback signal of the imaginary part of feedback information.

As another scheme, extraction element can be used for alternately extracting with the corresponding detectable signal of first beam and with the corresponding detectable signal of second beam, and generation device can be used for alternately producing based on first feedback signal of the channel estimation of first beam with based on second feedback signal of the channel estimation of second beam.

Moreover, can determine the emission weighted information by the filtering feedback information being quantified as desired quantification clump.In this case, the filtering feedback information can comprise 4 accumulation points or state, for example can comprise 8 or 16 accumulation points or state and quantize clump.The feedback signal filtering operation can be that N moving average filter of sampling finished by length, and wherein N is greater than described multiplexing feedback signal number.Therefore, can turn to by continuous quantity and desiredly have more multi-mode clump and improve emission weighting clump.

Moreover, also achieving the above object by a kind of emission diversity method of the wireless communication system of a transmitter unit and at least one receiver that comprises, described method comprises the steps:

According to the determined weighted information of feedback information transmission signals is sent to described at least one receiver from described transmitter unit;

From of the response of described at least one receiver, obtain described feedback information to described transmission signals;

Described feedback information is fed back to described transmitter unit; With

Determine described weighted information by described feedback information being carried out filtering and the filtering feedback information being quantified as desired quantification clump.

In addition, also the transmitter by a kind of wireless communication system achieves the above object, and this transmitter comprises:

Extraction element is used for extracting feedback information from received signal;

Emitter is used for according to weighted information transmission signals being sent from transmitter unit;

Determine device, be used for determining described weighted information according to the feedback information of described extraction; With

Control device is used for feedback information to described extraction and carries out filtering and be used for the filtering feedback information is quantified as desired quantification clump.

Therefore, in a certain feedback system, launch the weighting clump by the filtering feedback signal is quantized to improve continuously, and the capacity of feedback channel remains unchanged.Therefore, user terminal or travelling carriage needn't be known and adopted the sort of clump.In view of the above, the quantification clump in the receiver can be different from the emission clump.The emission clump can for example load with power amplifier and change, and makes, only uses up the weighting (in view of the above, can ignore the gain signaling in 16 state clumps) of total power balance in given time slot.

Control device preferably includes a kind of moving average filter, is used to carry out the feedback signal filtering operation.

Below, according to preferred implementation in detail the present invention is described in detail with reference to accompanying drawing, wherein:

Fig. 1 shows a kind of theory diagram that comprises the transmit diversity device of base station and travelling carriage,

Fig. 2 shows the table of the characteristic parameter of an expression STD and TxAA mode,

Fig. 3 A-3C shows the table of the expression characteristic parameter relevant with the FEEDBACK CONTROL of STD and TxAA mode respectively,

Fig. 4 shows the table of expression according to the characteristic parameter of the transmit diversity thought of the first routine preferred implementation of the present invention,

Fig. 5 shows according to the base station of preferred implementation of the present invention and the theory diagram of travelling carriage,

Fig. 6 shows the figure according to the complex weighting parameter of the first routine preferred implementation,

Fig. 7 shows the table of expression according to the characteristic parameter of the transmit diversity thought of the second routine preferred implementation,

Fig. 8 shows the figure according to the complex weighting parameter of the second routine preferred implementation.

Below, according to the BS 10 of the UMTS shown in Fig. 1 and the connection between the MS 20 preferred implementation according to this method and system of the present invention is described.

According to preferred implementation of the present invention, feedback information is to adopt to send to BS's 10 based on time-multiplexed feedback thought from MS 20.This means that used quantification clump is to be changed and to be notified to BS 10 at different time slots when obtaining feedback signal.But, in feedback channel, also can adopt any other multiplex mode (as frequency division multiplexing or code division multiplexing).

Specifically, the feedback signal clump can change according to coding, type, division or the distribution of feedback information.Therefore, for existing time division multiplexing feedback subchannel, can keep desired signaling capacity in the feedback channel, and feedback information itself can be extended on the time shaft, can be sent out in two or more time slots (group), these time slots can be assigned with according to the pre-defined rule that BS 10 and MS 20 all know.

Below, with reference to Fig. 4-8 some examples of preferred implementation are described, wherein feedback information is extended on the continuous time slot.

Fig. 4 shows the table of the thought of two improved TxAA modes 1 of expression.According to this example, in MS 20, utilize two reference channels (channel that promptly is used for channel estimation and the estimation of rotation channel), so that obtain feedback information.In view of the above, utilizing the feedback signaling of TxAA mode 1 is that two feedback bits can be realized 8 phase bit signalings.Specifically, send and the first relevant feedback information of channel estimation with two continuous slots, and send and the second relevant feedback information of rotation channel estimation with two continuous slots subsequently.

Therefore, send whole feedback information with 4 continuous slots.Correspondingly, with the time slot S1={1 of the first feedback subchannel defined, 2,5,6,9,10 ... } send with channel and estimate relevant phase difference, and with the time slot S2{3 of the second feedback subchannel defined, 4,7,8,11,12 ... } send the phase difference be quantified as the rotation clump, wherein, this rotation channel estimation relates to 45 ° of rotation channels estimation (4 phase place clumps are adopted in supposition).

Therefore, the effective phase difference of the phase bits that sends with time slot S1 is as going up shown in the table among Fig. 4, and the determined phase difference of phase bits that sends with time slot S2 is shown in the following table among Fig. 4.Therefore, as in the TxAA mode 1, when once only using 2 bits of feedback information, amount of phase difference can be changed into 8 values.Operate resulting feedback resolutions as a result corresponding to 16 state feedback modes by filtering or demultiplexing in BS 10, each adopts antenna A1 and A2 except the situation of firm power.Therefore, can improve feedback resolutions, keep the feedback signaling capacity of TxAA mode 1 simultaneously.

Fig. 5 shows according to the MS 20 of preferred implementation of the present invention and the theory diagram of BS 10.

According to Fig. 5, BS 10 comprises transceiver (TRX) 11, is used to two antenna A1 to be connected with the A2 feed and with extraction unit 12, and extraction unit is used for extracting MS 20 by feedback information that corresponding feedback channel sent.The feedback information that is extracted is input to switch 13, and timing control unit 15 is controlled this switch according to the timing mode as the basis of the multiplex mode of the used feedback signal clump of MS 20.In view of the above, provide demultiplexing or the filter function that is used to extract feedback information.In this example, switch 13 so that the feedback information relevant with time slot S1 offered an one output, and will be exported to its another output by timing control unit 15 controls with the feedback information that time slot S2 is sent.

Note,, can alternately finish above-mentioned demultiplexing or filter function by filter and demodulating unit or decoding unit are provided so if adopt frequency division or code division multiplexing mode respectively.

The output of switch 13 is connected with each input of weighting determining unit 14 respectively, and this weighting determining unit is determined weighted signal according to the table shown in Fig. 4.Specifically, weighting determining unit 14 is by to averaging to determine the phase difference between desired antenna A1 and the A2 through received two the time slot type S1 of input separately and the feedback information on the S2.But, also can provide any other of this two kinds of feedback informations synthetic.

Determined weighted signal (for example phase difference) is input to TRX 11, and TRX carries out the respective phase control of antenna A1 and A2, thereby establishes desired phase difference, so that obtain the best coherence of transmission signals in MS 20.

MS 20 comprises transceiver (TRX) 21, is used for receiving from the antenna A1 of BS 10 and the transmission signals of A2 by the antenna that is connected with it.Moreover TRX 21 also is connected with extraction unit 22, and extraction unit is used for extracting the channel signal and the channel signal of piloting that is extracted is input to channel estimation unit 23 of piloting, and channel estimation unit calculates desired channel estimation.In the WCDMA system, utilize from two antenna A1 adopting specific orthogonal spreading code and A2 institute continuously the common channel of emission pilot (CPICH) can obtain the estimation of suitable precise channels.Specifically, channel estimation unit 23 is used for calculating channel estimation and the estimation of rotation channel, and the two is all corresponding with the channel signal of piloting that is received.Channel estimation unit 23 outputs to its output separately with these two channel estimations, these outputs obtain to be connected with the respective input of quantifying unit 24 with bad channel, and this unit 24 is used to obtain based on the channel estimation that obtains from channel estimation unit 23 and rotates the phase difference of channel estimation and carry out corresponding quantization.As noted earlier, the estimation of rotation channel is by obtaining channel estimation rotation 45.

Moreover feedback timing unit 25 is used for that the control phase difference obtains and quantifying unit 24, so that according to feedback on reservation regularly, output is estimated one of phase difference that obtains from channel estimation and rotation channel.In this example, during time slot S1, output is poor with channel estimation (being conventional TxAA mode 1) respective phase, and during time slot S2, output is poor with rotation channel estimation respective phase.These phase differences are input to TRX 21 as multiplexing feedback signal, so that be sent to BS 10 by corresponding feedback channel.

It should be noted that, if it is resulting that BS 10 each feedback information of supposition all are the channel estimation that never is rotated, that is to say it is the existing BS10 that is controlled according to TxAA mode 1, so according to the transmit diversity thought and existing TxAA mode 1 compatibility of the first routine preferred implementation.

If adopt frequency division or code division multiplexing feedback system, can replace feedback timing unit 25 with modulating unit or coding unit respectively so.

Fig. 6 shows that the complex weighting as feedback information is the figure of the terminal point of weight vectors in the first routine preferred implementation.Specifically, the circle in the figure of Fig. 6 is illustrated in the weighting that the weighting that obtains among the time slot S1 is conventional TxAA mode 1, and cross is illustrated in the other weighting that obtains among the time slot S2.Therefore, can under the prerequisite that does not increase the feedback channel signaling capacity, obtain quantizing as the phase difference that is provided in the TxAA mode 2.

Fig. 7 illustrates the second routine preferred implementation, wherein, when only adopting single feedback bits, obtains the feedback resolutions of TxAA mode 1.Therefore, this example is relevant with modified model STD mode.Specifically, it is channel estimation that MS 20 for example carries out continuous measurement according to sliding window, and phase difference obtains device 24 and quantizes phase difference according to the phase place clump of TxAA mode 1.In this example, the real part of the determined complex weighting of phase difference and the feedback bits of imaginary part send with continuous time slot, and for example the real part bit sends in the strange time slot as first feedback subchannel, and the imaginary part bit sends in the even time slot as second subchannel.Control corresponding is realized by the feedback timing unit 25 of MS 20.

Correspondingly, the timing control unit 15 control switchs 13 of BS 10, so that with each input that the continuous real part and the imaginary part of feedback information is input to weighting determining unit 14, determining unit determines to be input to accordingly the weighted signal of TRX 11, so that establish desired phase difference.

If BS 10 controls not according to this time control mode, promptly adopt existing STD mode, will obtain conventional control so.If adopt new timing controlled, weighting determining unit so 14 averages on two time slots, and correspondingly changes weighted signal.

Therefore, utilize the feedback capacity of STD mode can obtain 4 state distinguishabilities.Moreover, for each continuous bit, can relate separately to the weighting checking, this meets STD thought.

Therefore, as listed from Fig. 7, strange time slot S _OddIn the feedback information that provided represent the phase difference of 0 ° or 180 °, and even time slot S _EvenIn the feedback information that provided represent-90 ° or+90 ° phase difference.

Fig. 8 shows the figure of the complex weighting that can be fed of the second routine preferred implementation in each time slot, wherein, cross is illustrated in time slot S _EvenIn the weighted information that sent, and circle is illustrated in time slot S _OddIn the weighting that sent.

In above-mentioned second example, the channel estimation unit 23 of MS 20 can utilize the public channel of piloting (CPICH) to determine the channel estimation.So, the phasor of the phase place of expression complex weighting

Determine by bad channel acquisition and quantifying unit 24, and be quantified as clump shown in Figure 7, i.e. S ₁=1 ,-1} (for strange time slot) and S ₂={ i ,-i} (for even time slot).Corresponding feedback message (phase bits) is " 0 " and " 1 ", and wherein, " 0 " expression first accumulation point more approaches this phasor.Similarly, feedback message " 1 " expression second accumulation point more approaches this phasor.As mentioned above, adopt above these two kinds reference clumps, can realize such thought: terminal (MS 20) sends the imaginary part and the real part of the up-to-date estimation of downlink channel with continuous time slot (or with two subchannels).

In second example, BS 10 can carry out filtering (on average) to the feedback weight/phase place in two continuous slots, keeps two antenna A1 identical with institute's emitted power among the A2 simultaneously.Therefore, resulting weighting clump has 4 states (being similar to QPSK (quadriphase PSK)).On average can cause the time-delay of half time slot in output, therefore, total signaling time-delay is a half crack.Therefore, compare with the thought that only just is weighted after whole feedback words is received, the master control time-delay has reduced time slot half.

Owing to have only 4 possible weightings, therefore, can effectively utilize dedicated channel and pilot (with the channel estimation), so which weighting is checking in fact sent.In case learn this weighting, just can be according to the product of this weighting with the channel of determining from common channel estimation, obtain the diversity antenna that received and the channel vector between the terminal.Therefore, checking allows to adopt continuous common channel estimation when high specific is synthetic.

According to the 3rd routine preferred implementation, feedback system can adopt beam diversity thought, so that a kind of robustness error protection signaling of enhancing is provided.In the 3rd example, suppose and in MS20, adopt space time coding (STTD), wherein coded channel symbol is divided into some binary pieces, and during time interval 2n and 2n+1, utilize identical extended code respectively from antenna A1 and A2 by b[2n], b[2n+1] and-b ^*[2n+1], b ^*[2n] mode sends.This simple symbol level orthogonal coding mode has doubled time diversity, and wherein, receiver can adopt simple linear codec to detect the code element that is sent.In this example, use two weight vectors, they all are the functions that receives signaling.In STD mode feedback signaling, carry out following processing.

The antenna A1 of BS 10 and A2 are with each two beam B1 of time slot emission and B2.The renewal rate of beam B1 and B2 is 800Hz, and promptly in other words, the time slot in TRX 11 every cracks upgrades once.Specifically, beam B1 is updated during strange time slot, and beam B2 is updated during even time slot, and wherein, it is just effective that each weighting is updated on two time slots, promptly provides the sliding window weighting to change.Therefore, the extraction unit 22 of MS 20 is used for extracting accordingly detection or the pilot signal that receives from beam B1 and B2, and successively they is input to channel estimation unit 23.Then, feedback timing unit 25 control phase differences obtain unit 24, so as with the corresponding sequential output of the time slot of distributing to them phase difference separately.

It should be noted that, in this example, if TRX 11 can be used to determine the weighted signal that is received and can correspondingly successively the weighted signal that is received be assigned to its beam B1 or B2 separately, then need not switch unit (or the filter unit) 13 of BS 10 and the filter function that timing control unit 15 is provided.Yet, if situation is not like this, so, timing control unit 15 control switch units 13, so that the weighted signal of (being launched with strange time slot) beam B1 is switched to an one output, and the weighted signal of (being launched with even time slot) beam B2 switched to another output, then, weighting determining unit 14 is determined corresponding weighted signals.In addition, timing control unit 15 also can be used to control TRX 11, so that the weighted signal that is received is distributed to corresponding beam B1 or B2.This control characteristic is shown in the dotted line in the block diagram of the BS10 of Fig. 5.

Quantification in the existing STD mode of the described any filtering that does not comprise feedback signal in BS 10 of beginning and signaling thought can only realize that the original beams with the effective weighting resolution of 180 degree form.

In the above-mentioned second routine preferred implementation, the filtering of the feedback bits of two connections (being real part and imaginary part) (or average) can bring up to 4 with status number, and forces these emission weightings of storage.

According to another kind of filtering method,, can further improve weighting resolution by increasing the status number in the weighting clump.Preferably can obtain single feedback system, can make like this transmission weighting (clump) blind adaptation given channel.

Here the blind processing that will consider is based on such fact: the uplink signal that is received has the average characteristics identical with down link signal, although these channels are not reciprocity in this FDD (Frequency Division Duplexing (FDD)) system.This average information (as number of vias, Doppler estimation etc.) can be used to BS 10 in filtering match, like this, for example in fast fading channel, filter is shorter, and in very slow fading channel, uses the filter than narrow bandwidth.Therefore, MS 20 can send feedback signal (for example according to second example) all the time, and MS 20 need not to know definitely actual filtering thought.Feasible filtering technique comprises FIR, IIR or nonlinear filtering operation (for example medium filtering).

Moreover, it is also conceivable that the reliability (thereby obtaining for example average weighted of back) of each feedback command that receives, so that alleviate the influence of unreliable feedback channel.

Below, the other example of preferred implementation is as the vague generalization example of above-mentioned second example.Yet, should be noted that following example also can realize well in existing STD that only adopts a feedback signal and TxAA mode.According to the 4th example, used the feedback of the rotation clump (real part and imaginary part) of adopting second example and measured, wherein the filtering operation among the BS 10 is applied on N rather than two feedback command (or time slot).Therefore, the emission weighting is provided by following formula: w2 (t)=exp (i Φ (t)) $\mathrm{\&Phi;}\left(t\right)=\arg \left(\underset{t^{\&prime;}=t}{\overset{t-N+1}{\mathrm{\&Sigma;}}}{i}^{t^{\&prime;}\mathrm{<figure-callout\; id="2"\; label="mod"\; filenames="A00800870.100311.png"\; state="\{\{state\}\}">mod</figure-callout>}2}\mathrm{sgn}\left(z\left(t^{\&prime;}\right)\right)\right)$

Wherein, the feedback signal that z (t)=b (t)+n (t) representative is received, n (t) is the noise signal among the BS 10, b (t) is that BS 10 is in time slot t (with state ± i in the formula ^Tmod2Corresponding) feedback command that receives, and w2 (t) representative is applied to complex weighting among diversity antenna A1 and the A2.

According to the 5th routine preferred implementation, 4 different clumps are provided in MS 10, like this, bad channel obtains and quantifying unit 24 is quantified as S with 4 continuous downlink time slots with complex weighting ₁=1 ,-1}, S ₂={ i ,-i}, S ₃={ i ^1/2,-i ^1/2And S ₄={ i ^-1/2,-i ^-1/2.BS10 utilize length for N the sampling moving average filter to Cong Jinhang filtering.When N=4, the 8-PSK clump that becomes in the time of can obtaining.The emission weighting is provided by following formula: w2 (t)=exp (i Φ (t)) $\mathrm{\&Phi;}\left(t\right)=\arg \left(\underset{t^{\&prime;}=t}{\overset{t-N+1}{\mathrm{\&Sigma;}}}{i}^{\left(t^{\&prime;}\mathrm{mod}4\right)/2}\mathrm{sgn}\left(z\left(t^{\&prime;}\right)\right)\right)$

According to the 6th routine preferred implementation, relate to the situation of three rotation clumps of in terminal quantizes, adopting 60 degree resolution.Wherein, S ₁=1 ,-1}, S ₂={ i ^1/3,-i ^1/3And S ₃={ i ^2/3,-i ^2/3, therefore filtered emission weighting is provided by following formula: w2 (t)=exp (i Φ (t)) $\mathrm{\&Phi;}\left(t\right)=\arg \left(\underset{t^{\&prime;}=t}{\overset{t-2}{\mathrm{\&Sigma;}}}{i}^{\left(t^{\&prime;}\mathrm{mod}3\right)/3}\mathrm{sgn}\left(z\left(t^{\&prime;}\right)\right)\right)$

According to the 7th routine preferred implementation, according to above-mentioned three clumps of the 6th example except the reliability that is used for received code element, also can be used for determining the emission beam, wherein, when filtering, can adopt diverse ways, for example function f (x)=x can replace sgn (x), or in the formula of above-mentioned definite Φ (x), can adopt tanh (x), and after filtering, complex weighting can be quantified as 4 states (QPSK).Should be noted that in above these examples that provide, at first make the hard decision (sgn (z (t '))) of feedback signal, carry out average operation then.Can obtain QPSK clump (although not describing in detail) like this.Yet quantification can not cater to the need, unless reduce status number, so that use effective weighting verification algorithm.

Certainly, in the 7th example, it all is possible being quantified as any clump (replacing QPSK).When need not to carry out power constraint, for example can adopt 16 state clumps.In these cases, the weighting checking is not-so-practical, but can use special use to pilot in the channel estimation.Therefore, weighting for example can be provided by following formula: $W2\left(t\right)=\underset{t^{\&prime;}=t}{\overset{t-2}{\mathrm{\&Sigma;}}}{i}^{\left(t^{\&prime;}\mathrm{mod}3\right)/3}\tanh \left(z(t^{\&prime;}\right)\left|a\right|/{\mathrm{\&sigma;}}^2)$

σ wherein ²The variance of the interchannel noise among the expression z (t '), and | α | the amplitude of the feedback command z (t ') that expression is received.

Notice that in these cases, the emission weighting needn't have constant amplitude.For example, when channel magnitude is 0 (or noise variance is ∞), the amplitude of weighting will be 0, and tanh (z (t ') | α |/σ ²) → 0, promptly under the disturbed situation of feedback, each antenna is by automatic disconnection.Usually, the amplitude of weighting certainly will be less than 1.Maximum (Tx power) is identical with the situation of former (non diversity) antenna.Note,, can also (for example in transmission, adopt Walsh sign indicating number w by the shielding feedback command for MS 20 _k, this moment, BS 10 required w _{K '}, k ' ≠ k) stops diversity transmission or control weighting effectively.If all terminals are all like this, so, the different user that will help making the control different antennae with load average in power amplifier.Can also adopt the shielding c of part correlation _k, this moment 0≤w _k ^Tc _k≤ 1.

Above-mentioned beam according to the 7th example forms thought applicable to removing TxAA mode 2.This will bring the following change to this thought.As previously described, for example utilize 3 state clumps (60 degree rotation), draw each feedback bits (and bit reliability).The transmitter, phase of time slot t is the linear combination of weighting possible in the special window.Then, filtered state is quantified as the nearest accumulation point that can be sent out, and it needn't belong to current those points that allow in the TxAA mode 2.Under TxAA mode 1 phase resolution situation, then adopt following algorithm: $W2\left(t\right)=8\mathrm{QPSK}\left(\underset{t^{\&prime;}=t}{\overset{t-3}{\mathrm{\&Sigma;}}}(i^{\left(t^{\&prime;}\mathrm{mod}2\right)/2}P(b\left(t^{\&prime;}\right)=I|z\left(t^{\&prime;}\right))+{(-i)}^{\left(t^{\&prime;}\mathrm{mod}2\right)/2}P(b\left(t^{\&prime;}\right)=-1|z\left(t^{\&prime;}\right)))\right){\mathrm{vt}}^{\&prime;}$

Wherein, 8PSK represents to be quantified as 8-PSK state, v _{T '}Represent for example FIR coefficient of moving average filter, and P (b=1|z) and P (b=-1|z) represent the conditional probability of situation b=1 and b=-1 respectively.These probability for example can obtain from make the minimized statistics of MSE (mean square error).

For Gaussian noise n, and tanh (z (t ＇) | α |/σ ²) function shows as the reliability weighting.Obviously, this tanh function can utilize well-known technology to be similar to.

Then, can utilize following formula: $W2\left(t\right)=8\mathrm{PSK}\left(\underset{t^{\&prime;}=t}{\overset{t-3}{\mathrm{\&Sigma;}}}{i}^{\left(t^{\&prime;}\mathrm{mod}3\right)/3}\tanh \left(z\left(t^{\&prime;}\right)\right|a|/{\mathrm{\&sigma;}}^2)\right){\mathrm{vt}}^{\&prime;}$

Moreover, can send an additional feedback bits, to specify the weighting w that is input to antenna A1 and A2 respectively ₁And w ₂Between relative power (for example 0.8 or 0.2).In MS 20, can adopt the weighting checking of being verified, and come regulation emission weighting can for example resembling in STD mode or the TxAA mode 2.Difference be BS 10 explain feedback command mode and with filtered semaphore change into which clump (for example, the QPSK under the application verification situation and adopting QPSK under the special-purpose situation of piloting, 8 or 16PSK).This thought makes system very healthy and strong.MS 20 need not to know BS 10 is in which kind of mode of employing, unless its application verification.Can utilize dedicated channel that the Tx clump is notified to terminal, perhaps can estimate the Tx clump according to the signal that is received.Moreover, also can adopt the suboptimum checking thought that can alleviate this problem.It may be the variation that quantizes clump among the BS 10 that mode changes, and from the angle of subscriber equipment, this is unimportant.

Therefore, can realize based on same or effective filtering technique of another emission clump and follow-up quantification.If pilot to the special use of for example having adopted TxAA mode 2 at downlink side, MS 20 needn't know which kind of clump of employing so.Yet if MS 20 has obtained quantizing clump (being that it is notified), it can use the weighting checking as in the STD mode so.

In addition, also can use the nonlinear filtering operation.This nonlinear filtering can utilize the weighting definite (utilizing known lattice) based on lattice to realize, wherein, no matter in TxAA mode 1 or in classification TxAA mode 2, BS 20 utilizes former feedback command sequence (comprising reliability information) and a kind of trellis of indicating possible conversion.Therefore, adopt sequence estimation device or MAP detector can calculate the emission weighting, wherein Zhuan Huan possibility depends on the reliability of feedback bits.Therefore, probability P described in the formula of front (b=1|z) and P (b=-1|z) and weighting trellis can help nonlinear weight to determine.

Should be noted that the said units in the block diagram shown in Fig. 5 also can be confirmed as the software feature of a control program, this control program control is configured in microprocessor such as the CPU among BS 10 and the MS 20.

Moreover the sets of signals of any kind is divided (for example for trellis code) and all be can be used to improve performance.Moreover different feedback signal clumps can be correlated with by utilizing one by one signaling.For example, first time slot or subchannel can be used for feeding back the information of indicating quadrant by the 4-PSK clump with higher reliability, and second time slot subsequently or subchannel can be used for feeding back the information of determining the clump in this quadrant.The feedback information of second subchannel can change based on difference, the sub-quadrant of Gray code or their combination in any.Here, the feedback bits one of regulation quadrant arrives BS 10, and the emission weighting just is changed, and then, can adjust the sub-quadrant of modified model according to up-to-date channel estimation, and when (for example adopting Gray code) sent the quadrant index, this estimation was disabled.Therefore, can avoid receiving all additional delays that feedback bits caused because of waiting in the existing thought.Moreover, MS 20 sudden change that institute can't follow the tracks of when the estimation dedicated channel parameters (degree of 180 under the 1 bit feedback situation, 90 under the dibit feedback spent, or the like) as in the existing thought can not appear.Therefore, incrementally use feedback information and not only can reduce time-delay, and can also realize more effective channel estimation and receiver performance.Feedback information also can relate to the phase difference of continuous slot.

As an example, in TxAA mode 2, can indicate the phase state of emission weighting with 3 bit Gray codes.Therefore, continuum of states is encoded as 000 (state 1), 001 (state 2), 011 (state 3), 010 (state 4), 110 (states 5), 111 (states 6), 101 (states 7) and 100 (states 8).Therefore, the 1st bit for above-mentioned coding, in trellis, can determine following possible conversion: state 1 → state 1 or 8, state 2 → state 2 or 7, state 3 → state 3 or 6, state 4 → state 4 or 5, state 5 → state 5 or 4, state 6 → state 3 or 6, state 7 → state 7 or 2, state 8 → state 8 or 1.Similarly, for the 2nd and 3 bits, can obtain possible conversion equally.Then, utilize this transitional information in the estimation of the emission weighting of the reliability that can improve having.

The present invention originally is not limited to two antenna A1 and A2, and also applicable to any multiple antenna transmitter, so that more high-resolution feedback is provided.Moreover, as mentioned above, can adopt the multiplex mode of any kind, need only BS 10 correspondingly filtering or selection feedback information.

Moreover the present invention is applicable to any wireless communication system that includes transmit diversity used between transmitter unit and at least one receiver or emission beam formation thought.Therefore, above-mentioned preferred implementation and accompanying drawing only are intended to illustrate the present invention.Preferred implementation of the present invention can change in the scope of appended claims book.

In a word, the present invention relates to a kind of emission diversity method that comprises the wireless logical full communication system of a transmitter unit and at least one receiver, wherein, transmission signals is sent at least one receiver from transmitter unit according to the determined weighted information of feedback information.Feedback information obtains from the response of at least one receiver to transmission signals, and utilizes multiplexing feedback signal to be fed.In addition, in transmitter unit, can be by described feedback information being carried out filtering and the filtering feedback information is quantified as desired quantification clump to determine weighted information.Therefore, volume clump and combination thereof and/or the feedback subchannel relevant with specific clump can be used for channel detection, like this, can improve total feedback resolutions, keep the low signaling capacity of feedback channel simultaneously.

Claims (63)

1. emission diversity method that comprises the wireless communication system of a transmitter unit and at least one receiver, described method comprises the steps:

A) according to the determined weighted information of feedback information transmission signals is sent to described at least one receiver from described transmitter unit;

B) from of the response of described at least one receiver, obtain described feedback information to described transmission signals;

C) utilize multiplexing feedback signal to feed back described feedback information.

2. the method for claim 1, wherein described multiplexing feedback signal comprises that at least having first quantizes first feedback signal of clump and have second feedback signal of the second quantification clump.

3. method as claimed in claim 2, wherein, described at least the first and second feedback signals send with different time slots.

4. as claim 2 or 3 described methods, wherein, described at least the first and second feedback signals adopt different codes to be sent out.

5. as the arbitrary described method of claim 2-4, wherein, described first feedback signal has been stipulated to estimate determined first weighting according to being quantified as described first clump channel, and described second feedback signal has been stipulated to estimate determined second weighting according to being quantified as described second clump channel.

6. method as claimed in claim 5, wherein, described second clump is described first clump swivel replication.

7. method as claimed in claim 5, wherein, described second feedback signal is based on being quantified as described first clump rotation channel estimation.

8. as claim 2 or 3 described methods, wherein, described first and second feedback signals are fed with continuous time slot.

9. as claim 2,3 or 8 arbitrary described methods, wherein, described first feedback signal is stipulated the real part of described weighted information, and described second feedback signal is stipulated the imaginary part of described weighted information.

10. as claim 2,3 or 8 arbitrary described methods, wherein, described first feedback signal has stipulated to be used for to upgrade first feedback information of first beam of described transmitter unit, and described second feedback signal has stipulated to be used for to upgrade second feedback information of second beam of described transmitter unit.

11. as claim 9 or 10 described methods, wherein, described first feedback signal is fed during strange time slot, and described second feedback signal is fed during even time slot.

12. as claim 2,3 or 8 arbitrary described methods, wherein, described first feedback signal is come the regulation quadrant by the 4-PSK clump, and described second feedback signal is stipulated the accumulation point in the described quadrant of the described first feedback signal defined.

13. method as claimed in claim 12, wherein, the variation of described second feedback signal regulation difference, the sub-quadrant of Gray code or their combination.

14. the method for claim 1, wherein described multiplexing feedback signal is sent by at least two users with unlike signal clump.

15. method as claimed in claim 14, wherein, described at least two users comprise first group of user of the weighting in first antenna of controlling described transmitter unit and control second group of user of the weighting in second antenna of described transmitter unit.

16. the method for claim 1, wherein described feedback information is used for controlling the emission weighting of one of two antennas.

17. method as claimed in claim 16, wherein, described feedback information comprises about the first information of the transmitting power of described two antennas with about second information of the phase place of described two antennas.

18. method as claimed in claim 17, wherein, the described first information or described second information or the two are filtered respectively in described transmitter unit.

19. the method for claim 1, wherein described feedback information is used for controlling the emission weighting of two antennas.

20. method as claimed in claim 19, wherein, the control command that is used to control described two antennas alternately is sent to described transmitter unit.

21. the method for claim 1, wherein described transmitter unit comprises antenna array.

22. method as claimed in claim 21, wherein, described feedback information is used for controlling the transmit direction of described antenna array.

23. method as claimed in claim 22, wherein, transmit direction obtains from least one feedback signal.

24. method as claimed in claim 23, wherein, transmit direction obtains from the phase estimation of at least one feedback signal of extracting.

25. the method for claim 1, wherein determine described weighted information and/or transmit direction according to the feedback signal filtering operation.

26. method as claimed in claim 25 wherein, is determined described weighted information by the filtering feedback information being quantified as desired quantification clump.

27. method as claimed in claim 26, wherein, described desired clump depends on that the amplifier in the described transmitter unit loads.

28. method as claimed in claim 26, wherein, described filtering feedback information comprises 4 accumulation points, and described quantification clump comprises 8 or 16 accumulation points.

29. as the arbitrary described method of claim 25-28, wherein, the feedback signal filtering operation is that N filter of sampling finished by length, wherein N is greater than described multiplexing feedback signal number.

30. method as claimed in claim 25, wherein, described filtering operation comprises healthy and strong filtering, FIR filtering, IIR filtering, linear filtering, nonlinear filtering or level and smooth and prediction.

31. as the arbitrary described method of above claim, wherein, the reliability of described multiplexing feedback signal is used for weighting and determines.

32. method as claimed in claim 25, wherein, transmission filtering adapts to transmission channel characteristic and is dynamically altered.

33. method as claimed in claim 25 wherein, is controlled the filter characteristic of described filtering operation according to the signaling between described transmitter unit and described at least one receiver.

34. an emission diversity method that comprises the wireless communication system of a transmitter unit and at least one receiver, described method comprises the steps:

A) according to the determined weighted information of feedback information transmission signals is sent to described at least one receiver from described transmitter unit;

B) from of the response of described at least one receiver, obtain described feedback information to described transmission signals;

C) described feedback information is fed back to described transmitter unit; With

D) by described feedback information being carried out filtering and the filtering feedback information is quantified as desired quantification clump to determine described weighted information.

35. method as claimed in claim 34, wherein, the state that the quantification clump in described at least one receiver is had lacks than the state that is had in the described transmitter unit.

36. method as claimed in claim 35, wherein, described feedback information comprises 4 accumulation points, and described quantification clump comprises 8 or 16 accumulation points.

37. as the arbitrary described method of claim 34-36, wherein, the feedback signal filtering operation is finished by moving average filter.

38. as the arbitrary described method of claim 34-37, wherein, former feedback signal sequence is carried out the feedback signal filtering operation, and draws weighted information by the estimation of adopting trellis.

39. method as claimed in claim 38 wherein, adopts sequence estimation device or MAP detector to carry out described estimation.

40. the transmit diversity systems of a wireless communication system, this system comprises:

A) emitter (10) is used for that (A1 A2) sends from transmitter unit with transmission signals according to the determined weighted information of feedback information; With

B) at least one receiver (20) is used for receiving described transmission signals and obtains described feedback information from the response to described transmission signals;

C) wherein, described at least one receiver (20) comprises feedback device (24,25), is used to utilize multiplexing feedback signal to feed back described feedback information.

41. system as claimed in claim 40, wherein, described feedback device (24,25) is used for producing first feedback signal with first clump and second feedback signal with second clump.

42. system as claimed in claim 40, wherein, described first feedback signal has been stipulated to estimate determined first phase weighting according to channel, and described second feedback signal has been stipulated according to determined second phase weighting of the rotation clump of described first feedback signal.

43. system as claimed in claim 40, wherein, described first feedback signal is stipulated the real part of described weighted information, and described second feedback signal is stipulated the imaginary part of described weighted information.

44. system as claimed in claim 40, wherein, described first feedback signal has been stipulated and will be used for upgrading described transmitter unit (A1 by described emitter (10), first feedback information of first beam A2), and described second feedback signal has been stipulated and will be used for upgrading described transmitter unit (A1, second feedback information of second beam A2) by described emitter (10).

45. as claim 43 or 44 described systems, wherein, described feedback device (24,25) is used for feeding back described first feedback signal during strange time slot, and feeds back described second feedback signal during even time slot.

46. the transmitter of a wireless communication system, this transmitter comprises:

A) extraction element (12) is used for extracting feedback information from received signal;

B) emitter (11) is used for that (A1 A2) sends from transmitter unit with transmission signals according to weighted information;

C) determine device (14), be used for determining described weighted information according to the feedback information of described extraction; With

D) control device (13,15) is used to control described definite device (14), so that determine described weighted information according to the used multiplexing feedback signal of the described feedback information of feedback.

47. transmitter as claimed in claim 46, wherein, described control device (13,15) comprises a switching device shifter (13), is used for alternately will having first clump first feedback signal and has second clump second feedback signal switching to described definite device (14).

48. transmitter as claimed in claim 47, wherein, described definite device (14) is used for obtaining described weighted information from described first and second feedback signals.

49. transmitter as claimed in claim 47, wherein, described control device (13,15) be used for controlling described emitter (11), so that alternately utilize according to determined first weighted information of described first feedback signal and upgrade described transmitter unit (A1, A2) first beam and utilization are upgraded described transmitter unit (A1, second beam A2) according to determined second weighted information of described second feedback signal.

50. as the arbitrary described transmitter of claim 46-49, wherein, described transmitter unit be an antenna array (A1, A2).

51. transmitter as claimed in claim 46, wherein, described control device (13) is used for carrying out the feedback signal filtering operation.

52. transmitter as claimed in claim 51, wherein, described control device (13,15) is used for the filtering feedback information is quantified as desired quantification clump.

53. as claim 51 or 52 described transmitters, wherein, described control device (13,15) comprises a moving average filter that is used to carry out the feedback signal filtering operation.

54. transmitter as claimed in claim 51, wherein, described filtering operation comprises healthy and strong filtering, FIR filtering, IIR filtering, linear filtering, nonlinear filtering or level and smooth and prediction.

55. the transmitter of a wireless communication system, this transmitter comprises:

A) extraction element (12) is used for extracting feedback information from received signal;

B) emitter (11) is used for that (A1 A2) sends from transmitter unit with transmission signals according to weighted information;

C) determine device (14), be used for determining described weighted information according to the feedback information of described extraction; With

D) control device (13,15) is used for feedback information to described extraction and carries out filtering and be used for the filtering feedback information is quantified as desired quantification clump.

56. transmitter as claimed in claim 55, wherein, described control device (13,15) comprises a moving average filter that is used to carry out the feedback signal filtering operation.

57. the receiver of a wireless communication system, this receiver comprises:

A) receiving system (21) is used to receive transmission signals;

B) obtain device (22,23,24), be used for obtaining feedback information from response to described transmission signals; With

C) feedback device (24,25) is used to utilize multiplexing feedback signal to feed back described feedback information.

58. receiver as claimed in claim 57, wherein, described acquisition device (22,23,24) comprising: extraction element (22) is used to extract the detectable signal that sends with known power; Channel estimating apparatus (23) is used for carrying out the channel estimation according to the described detectable signal that extracts; And generation device (24), be used for producing described multiplexing feedback signal according to described channel estimation.

59. receiver as claimed in claim 58, wherein, described generation device (24) is used for producing first feedback signal with first clump and second feedback signal with second clump, wherein said feedback device (24,25) is used for feeding back described first and second feedback signals as described multiplexing feedback signal.

60. receiver as claimed in claim 59, wherein, described feedback device (24,25) is used for alternately feeding back described first and second feedback signals, and wherein the quantification of feedback information is based on that available clump in the estimation of up-to-date channel and described first and second clumps.

61. receiver as claimed in claim 59, wherein, described generation device (24) is used for producing based on described first feedback signal of described channel estimation with based on described second feedback signal of described channel estimation by the predetermined angular rotation.

62. receiver as claimed in claim 59, wherein, described generation device (24) is used for producing based on described first feedback signal of the real part of described feedback information with based on described second feedback signal of the imaginary part of described feedback information.

63. receiver as claimed in claim 59, wherein, described extraction element (22) be used for alternately extracting with the corresponding detectable signal of first beam and with the corresponding detectable signal of second beam, and described generation device (24) is used for alternately producing based on described first feedback signal of the channel estimation of described first beam with based on described second feedback signal of the channel estimation of described second beam.

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